Improvement in machines for calendering printed paper



N.PERS. FHOTO-LITHOGRJPHER. WASHINGTON. D C.

G DUNCAN MACHINE FOR CALENDERING PRINTED PAPER.

'UNITED N STATES PATENT QFFIGE.

GEORGE DUNCAN, OE LIVERPOOL, ENGLAND.

IMPROVENIENI IN MACHINES FOR CALENDERING PRINTED PAPERS.

Specification forming part of Letters Patent No. 175,056, dated March 21, 1876 application filed January 28, 1876.

To all whom it may concern: ,y

Be it known that I, GEORGE DUNCAN, of Liverpool, England, have invented a new and useful Improvement'in Machine for Finishing Printed Paper; and I do hereby declare the following to be a full, clear, and exact description thereof', reference being had to the accompanying drawing, forming part of this specification, in which- Figure lis an elevation of a machine embodying my invention. Fig. 2 is a transverse section. Fig. 3 is a detached enlarged view of a buffer-roll.

Like letters refer to like parts wherever they occur.

My invention relates .to that class of apparatus employed for finishing or surfacing printed sheets of paper or other material, and is an improvement on Letters Patent No. 3,605, granted to James Morris, January 20,

4. My invention consists, rst, in giving a lateral or endwise motion to the take-oli or bufting devices employed in conjunction with the set-olf rolls, whereby the set-off roll is e'ectually cleaned; secondly, in combining with the set-off rolls an elastic or yielding stripperknife, whereby the paper is stripped from the set-oft' roll, and all liability ot' blurring the sheet is avoided; and, thirdly, in details of constructionhereinafter specified.

Previous to the Morris English patents, (Nos.vl,746, of 1868 and 1,728, of 1872,) and his United States: patent above cited, the common manner of finishing printed matter was by means of a hydraulic or similar press wherein the sheets were subjected to pressure between mill-boards. By the Morris method the printed sheets are passed continuously through between, and in direct contact with, steam or similarly heated rolls, the surfaces of which are kept clean ,by Whiting or like powdery substance applied thereto, and pads or rotary take-off buiflng rolls, which remove the pulverulent matter composed of the ink and powder. In'the Morris machine the de` livery of the printed sheet is insured bya pair of revolving brushes. In operati-ng the Mor-- ris machine I iind` that an ordinary pad .or wiper, or even a rotary bufling-roll, will not insure the cleaning of the set-oi rolls under all circumstances, and where some kinds of inks are employed in printing the sheet; and I further find that where revolving brushes are used in combination with the set-oli rolls to prevent the sheets from being carried around with said rolls they are liableto gather ink from the set-off rolls and deface the sheet being delivered.

The object of the present invention is to obviate the difficulties specified and obtain an effective machine.

I will now proceed to describe my invention so that others skilled in the art to which it appertains may apply the same.

In the drawing, A indicates a suitable framework, in which are adjustablyjournaled the hollow chilled rolls B B', provided with pinious, or otherwise geared to move together. These rolls are heated by introducing steam through the hollow journals or in other suitable manner, and are termed the set-0E rolls. Partially surrounding and moving in contact with the set-ott' rolls B B are a series of takeoff or bniing rolls, b b, preferably made of felt disks compressed and held upon a shaft, or they may be plain rolls surfaced with felt, woven fabric, or like substance, which will act as a rubber. The shafts of the buftiug-rolls b b are provided with pinious or equivalent devices, so that they can be driven by positive power, and are pret'erably driven at a greater surface speed than the set-oil rolls B B', and in a reverse direction, as indicated by the arrows. The shafts of these rolls b b are journaled so as to permit an endwise play of the rolls, and are cam-grooved, as at b1, to operate with a fixed pin, b2, or lug, by which means a scouring or scrubbing contact between the setoi1 and take-oli' or buiiing-roll is-obtained. Each of the bufling-rolls b b may be provided with rotary or stationary cleaning-brushes g, and casings h for inclosing the rolls may be of the character specified in the Morris patents, or of any approved form. C C are cross bars supported in the main frame A in rear of the set-oi rolls, and to said bars are secured the strippers d d, made of thin steel or like elastic metal, the free ends of the blades resting against the periphery ofthe rolls B B just oli' the bite. E are perforated cylinders or containers for the Whiting or other powdered material employed mounted in journals on the frame A, and operated from the set-ofi' rolls by tappets, so as to feed the powder to the set-0E rolls regularly and quietly, avoiding the noise incident to the use of a shaking coni tainer.

The operation of these devices is as follows: The sheet, being fed from a suitable table in theline of the arrow, is seized by the set-oi rolls, which press, smooth, dry, and polish the sheet, any surplus ink being taken o by the rolls B B. The set-ofi' rolls continuing to revolve receive upon their surfaces the Whiting or like powdered substance which absorbs the ink, forming a mass, which is eiectually removed by the scouring or scrubbing motion of the takeoff or buing rolls. Any tendency of' the sheet to follow the set-ott' rolls is obviated by the strippers.

The advantages arising from imparting an endwise motion to the buingrolls is that the set-oft' rolls are kept perfectly clean, and subi stances which would be simply spread by a rubbing-pad or rotary brush are wiped off by the dragging motion of the rollers b b. The advantage of the blade-stripper is that it does not gather ink from the-seto roll and transmit it to the sheet, as will frequently occur with a rotary brush or like device.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. In a machine for finishingl printed paper, the combination of the` set-off Vroll with the takeoff roll or buiing device, capable of motion across the roll or in the line of the axis of the takeoff roll, substantially as and for the purpose described.

2. In a machine for inishing printed paper, the combination of" the set-o rolls with the elastic or yielding stripping-blade, substantially as and for the purpose specified.

In testimony whereof I, the said GEORGE DUNCAN, have hereunto set my hand.

GEORGE DUNCAN.

Witnesses:

GEORGE LANDEB, F. W. RITTER, Jr. 

